(comparative more backbreakingly, superlative most backbreakingly)
backbreaking + -ly
"backbreakingly." YourDictionary, n.d. Web. 16 September 2018. <http://www.yourdictionary.com/backbreakingly>.
backbreakingly. (n.d.). Retrieved September 16th, 2018, from http://www.yourdictionary.com/backbreakingly
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